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server.js
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console.log("Starting PrairieLearn server...");
var _ = require("underscore");
var fs = require("fs");
var path = require("path");
var async = require("async");
var config = {};
config.timezone = 'America/Chicago';
config.deployMode = 'local';
if (process.argv.length > 2) {
if (process.argv[2] === "deploy") {
config.deployMode = 'engr';
}
}
config.questionsDir = "questions";
config.testsDir = "tests";
config.frontendDir = "../frontend";
config.secretKey = "THIS_IS_THE_SECRET_KEY"; // override in config.json
config.nodetimeAccountKey = 'SECRET_NODETIME_KEY'; // override in config.json
if (fs.existsSync('config.json')) {
try {
fileConfig = JSON.parse(fs.readFileSync('config.json', {encoding: 'utf8'}));
_.defaults(fileConfig, config);
config = fileConfig;
} catch (e) {
console.log("Error reading config.json:", e);
process.exit(1);
}
} else {
console.log("config.json not found, using default configuration...");
}
if (config.deployMode === 'engr') {
console.log("Starting nodetime...");
require('nodetime').profile({
accountKey: config.nodetimeAccountKey,
appName: 'Node.js Application'
});
console.log("nodetime started");
}
var requirejs = require("requirejs");
requirejs.config({
nodeRequire: require,
baseUrl: config.frontendDir + '/require',
});
var logFilename;
if (config.deployMode === 'engr') {
logFilename = '/var/log/apiserver.log';
} else {
logFilename = 'server.log';
}
var winston = require('winston');
var logger = new (winston.Logger)({
transports: [
new (winston.transports.Console)({level: 'warn', timestamp: true, colorize: true}),
new (winston.transports.File)({filename: logFilename, level: 'info'})
]
});
logger.info('server start');
requirejs.onError = function(err) {
var data = {errorMsg: err.toString()};
for (var e in err) {
if (err.hasOwnProperty(e)) {
data[e] = String(err[e]);
}
}
logger.error("requirejs load error", data);
};
var hmacSha256 = require("crypto-js/hmac-sha256");
var gamma = require("gamma");
var numeric = require("numeric");
var PrairieStats = requirejs("PrairieStats");
var PrairieModel = requirejs("PrairieModel");
var express = require("express");
var https = require('https');
var app = express();
var SAMPLE_INTERVAL = 60 * 1000; // ms
var nSample = 0;
var STATS_INTERVAL = 10 * 60 * 1000; // ms
var skipUIDs = {};
if (config.deployMode === 'engr') {
skipUIDs["user1@illinois.edu"] = true;
skipUIDs["mwest@illinois.edu"] = true;
skipUIDs["zilles@illinois.edu"] = true;
skipUIDs["dullerud@illinois.edu"] = true;
skipUIDs["tomkin@illinois.edu"] = true;
skipUIDs["ertekin@illinois.edu"] = true;
skipUIDs["jkrehbi2@illinois.edu"] = true;
skipUIDs["aandrsn3@illinois.edu"] = true;
skipUIDs["farooq1@illinois.edu"] = true;
skipUIDs["jsandrs2@illinois.edu"] = true;
skipUIDs["knguyen9@illinois.edu"] = true;
skipUIDs["linguo2@illinois.edu"] = true;
skipUIDs["saggrwl3@illinois.edu"] = true;
skipUIDs["hwang158@illinois.edu"] = true;
skipUIDs["mfsilva@illinois.edu"] = true;
skipUIDs["gladish2@illinois.edu"] = true;
skipUIDs["ffxiao2@illinois.edu"] = true;
}
var superusers = {
"user1@illinois.edu": true,
"mwest@illinois.edu": true
};
app.use(express.json());
var db, countersCollect, uCollect, sCollect, qiCollect, statsCollect, tCollect, tiCollect;
var MongoClient = require('mongodb').MongoClient;
var newID = function(type, callback) {
var query = {_id: type};
var sort = [['_id', 1]];
var doc = {$inc: {seq: 1}};
countersCollect.findAndModify(query, sort, doc, {w: 1, new: true}, function(err, item) {
if (err) return callback(err);
var id = type.slice(0, type.length - 2) + item.seq;
callback(null, id);
});
};
var newIDNoError = function(req, res, type, callback) {
newID(type, function(err, id) {
if (err) return sendError(res, 500, "Error getting new ID of type " + type, err);
callback(id);
});
};
var processCollection = function(name, err, collection, options, callback) {
if (err) {
logger.error("unable to fetch '" + name + "' collection", err);
callback(true);
return;
}
logger.info("successfully fetched '" + name + "' collection");
var tasks = [];
if (options.indexes) {
_(options.indexes).each(function(index) {
tasks.push(function(cb) {
collection.ensureIndex(index.keys, index.options, function(err, indexName) {
if (err) {
logger.error("unable to create index on '" + name + "' collection", index, err);
return cb(err);
}
logger.info("have '" + name + "' index: " + indexName);
cb(null);
});
});
});
}
if (options.idPrefix) {
tasks.push(function(cb) {
var idName = options.idPrefix + "id";
countersCollect.update({_id: idName}, {$setOnInsert: {seq: 0}}, {w: 1, upsert: true}, function(err, result) {
if (err) {
logger.error("unable to create counter for " + idName, index, err);
return cb(err);
}
logger.info("have counter for " + idName);
cb(null);
});
});
}
async.series(tasks, function(err, results) {
if (err) return callback(err);
callback(null);
});
};
var loadDB = function(callback) {
var dbAddress;
switch (config.deployMode) {
case 'engr': dbAddress = "mongodb://prairielearn3.engr.illinois.edu:27017/data"; break;
default: dbAddress = "mongodb://localhost:27017/data"; break;
}
MongoClient.connect(dbAddress, function(err, locDb) {
if (err) {
logger.error("unable to connect to database", err);
callback(true);
return;
}
logger.info("successfully connected to database");
db = locDb;
async.series([
function(cb) {
db.collection('counters', function(err, collection) {
countersCollect = collection;
var options = {};
processCollection('counters', err, collection, options, cb);
});
},
function(cb) {
db.collection('users', function(err, collection) {
uCollect = collection;
var options = {
indexes: [
{keys: {uid: 1}, options: {unique: true}},
],
};
processCollection('users', err, collection, options, cb);
});
},
function(cb) {
db.collection('submissions', function(err, collection) {
sCollect = collection;
var options = {
idPrefix: "s",
indexes: [
{keys: {sid: 1}, options: {unique: true}},
{keys: {uid: 1}, options: {}},
],
};
processCollection('submissions', err, collection, options, cb);
});
},
function(cb) {
db.collection('qInstances', function(err, collection) {
qiCollect = collection;
var options = {
idPrefix: "qi",
indexes: [
{keys: {qiid: 1}, options: {unique: true}},
{keys: {uid: 1}, options: {}},
],
};
processCollection('qInstances', err, collection, options, cb);
});
},
function(cb) {
db.collection('statistics', function(err, collection) {
statsCollect = collection;
var options = {};
processCollection('statistics', err, collection, options, cb);
});
},
function(cb) {
db.collection('tests', function(err, collection) {
tCollect = collection;
var options = {
indexes: [
{keys: {tid: 1}, options: {unique: true}},
],
};
processCollection('tests', err, collection, options, cb);
});
},
function(cb) {
db.collection('tInstances', function(err, collection) {
tiCollect = collection;
var options = {
idPrefix: "ti",
indexes: [
{keys: {tiid: 1}, options: {unique: true}},
{keys: {uid: 1}, options: {}},
],
};
processCollection('tInstances', err, collection, options, cb);
});
},
], function(err) {
if (err) {
logger.error("Error loading DB collections");
callback(true);
} else {
logger.info("Successfully loaded all DB collections");
callback(null);
}
});
});
};
var questionDB = {};
var testDB = {};
var loadInfoDB = function(db, idName, parentDir, loadCallback) {
fs.readdir(parentDir, function(err, files) {
if (err) {
logger.error("unable to read info directory: " + parentDir, err);
loadCallback(true);
return;
}
async.each(files, function(dir, callback) {
var infoFile = path.join(parentDir, dir, "info.json");
fs.readFile(infoFile, function(err, data) {
if (err) {
logger.error("Unable to read file: " + infoFile, err);
callback(null);
return;
}
var info;
try {
info = JSON.parse(data);
} catch (e) {
logger.error("Error reading file: " + infoFile + ": " + e.name + ": " + e.message, e);
callback(null);
return;
}
if (info.disabled) {
callback(null);
return;
}
info[idName] = dir;
db[dir] = info;
return callback(null);
});
}, function(err) {
if (err) {
logger.error("Error reading data", err);
loadCallback(err);
return;
}
logger.info("successfully loaded info from " + parentDir + ", number of items = " + _.size(db));
loadCallback();
});
});
};
var initTestData = function(callback) {
async.each(_(testDB).values(), function(item, cb) {
tCollect.findOne({tid: item.tid}, function(err, obj) {
if (err) {
logger.error("error accessing tCollect for tid: " + item.tid, err);
cb(err);
return;
}
if (obj) {
delete obj._id;
} else {
obj = {};
}
loadTestServer(item.tid, function(server) {
var options = {
timezone: config.timezone,
};
var defaultOptions = server.getDefaultOptions();
_(options).extend(defaultOptions, item.options);
item.options = options;
server.updateTest(obj, item.options);
_(obj).extend(item);
tCollect.update({tid: item.tid}, {$set: obj}, {upsert: true, w: 1}, function(err) {
if (err) {
logger.error("Error writing to tCollect", {tid: item.tid, err: err});
cb(err);
return;
}
cb(null);
});
});
});
}, function(err) {
if (err) {
logger.error("Error initializing test data", err);
callback(err);
return;
}
logger.info("successfully initialized test data");
callback(null);
});
};
var logRequest = function() {
nSample += 1;
};
var monitor = function() {
var requestsPerSecond = nSample / SAMPLE_INTERVAL * 1000;
logger.info("request rate", {
sampleInterval: SAMPLE_INTERVAL,
numberOfSamples: nSample,
requestsPerSecond: requestsPerSecond
});
nSample = 0;
};
var sendError = function(res, code, msg, err) {
logger.error("returning error", {code: code, msg: msg, err: err});
res.send(code, msg);
};
var checkObjAuth = function(req, obj) {
var authorized = false;
if (isSuperuser(req))
authorized = true;
if (obj.uid === req.authUID) {
if (obj.availDate === undefined) {
authorized = true;
} else {
if (Date.parse(obj.availDate) <= Date.now())
authorized = true;
}
}
return authorized;
};
var filterObjsByAuth = function(req, objs, callback) {
async.filter(objs, function(obj, objCallback) {
objCallback(checkObjAuth(req, obj));
}, callback);
};
var ensureObjAuth = function(req, res, obj, callback) {
if (checkObjAuth(req, obj)) {
callback(obj);
} else {
return sendError(res, 403, "Insufficient permissions: " + req.path);
}
};
var stripPrivateFields = function(obj) {
if (_.isArray(obj))
return _(obj).map(function(item) {return stripPrivateFields(item);});
if (!_.isObject(obj))
return obj;
var newObj = obj;
if (_(obj).has("_private")) {
newObj = _(obj).omit("_private");
var newObj = _(newObj).omit(obj._private);
}
_(newObj).each(function(value, key) {
newObj[key] = stripPrivateFields(value);
});
return newObj;
};
app.use(function(req, res, next) {
logRequest();
// hack due to RequireJS not providing header support
if (/^\/questions/.test(req.path)) {
req.authUID = "nouser";
next();
return;
}
// hack due to RequireJS not providing header support
if (/^\/tests/.test(req.path)) {
req.authUID = "nouser";
next();
return;
}
if (req.method === 'OPTIONS') {
// don't authenticate for OPTIONS requests, as these are just for CORS
next();
return;
}
if (config.deployMode !== 'engr') {
// by-pass authentication for development
req.authUID = "user1@illinois.edu";
} else {
if (req.headers['x-auth-uid'] == null) {
return sendError(res, 403, "Missing X-Auth-UID header");
}
if (req.headers['x-auth-name'] == null) {
return sendError(res, 403, "Missing X-Auth-Name header");
}
if (req.headers['x-auth-date'] == null) {
return sendError(res, 403, "Missing X-Auth-Date header");
}
if (req.headers['x-auth-signature'] == null) {
return sendError(res, 403, "Missing X-Auth-Signature header");
}
var authUID = req.headers['x-auth-uid'];
var authName = req.headers['x-auth-name'];
var authDate = req.headers['x-auth-date'];
var authSignature = req.headers['x-auth-signature'];
var checkData = authUID + "/" + authName + "/" + authDate;
var checkSignature = hmacSha256(checkData, config.secretKey);
checkSignature = checkSignature.toString();
if (authSignature !== checkSignature) {
return sendError(res, 403, "Invalid X-Auth-Signature for " + authUID);
}
req.authUID = authUID;
}
// add authUID to DB if not already present
uCollect.findOne({uid: req.authUID}, function(err, uObj) {
if (err) {
return sendError(res, 500, "error checking for user: " + req.authUID, err);
}
if (!uObj) {
uCollect.insert({uid: req.authUID}, {w: 1}, function(err) {
if (err) {
return sendError(res, 500, "error adding user: " + req.authUID, err);
}
next();
});
} else {
next();
}
});
});
var isSuperuser = function(req) {
if (superusers[req.authUID] === true)
return true;
return false;
};
app.use(function(req, res, next) {
if (req.method !== 'OPTIONS') {
logger.info("request",
{ip: req.ip,
authUID: req.authUID,
method: req.method,
path: req.path,
params: req.params,
body: req.body
});
}
next();
});
app.all('/*', function(req, res, next) {
// enable CORS on all requests, see http://enable-cors.org/server_expressjs.html
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Methods", "POST, PUT, PATCH, GET, OPTIONS");
res.header("Access-Control-Allow-Headers", "X-Requested-With, Accept, X-Auth-UID, X-Auth-Name, X-Auth-Date, X-Auth-Signature, Content-Type");
// disable all caching for all requests
res.header("Cache-Control", "max-age=0, no-cache, no-store, must-revalidate");
next();
});
// needed for CORs pre-flight checks
app.options('/*', function(req, res) {
res.json({});
});
// hack for development testing
if (config.deployMode !== 'engr') {
app.get("/auth", function(req, res) {
res.json(stripPrivateFields({
"uid": "user1@illinois.edu",
"name": "Test User",
"date": "2013-08-17T09:44:18Z",
"signature": "THIS_IS_THE_SECRET_SIGNATURE"
}));
});
}
app.get("/questions", function(req, res) {
async.map(_.values(questionDB), function(item, callback) {
callback(null, {qid: item.qid, title: item.title, number: item.number});
}, function(err, results) {
res.json(stripPrivateFields(results));
});
});
app.get("/questions/:qid", function(req, res) {
var info = questionDB[req.params.qid];
if (info === undefined)
return sendError(res, 404, "No such question: " + req.params.qid);
res.json(stripPrivateFields({qid: info.qid, title: info.title, number: info.number}));
});
var questionFilePath = function(qid, filename, callback, nTemplates) {
nTemplates = (nTemplates === undefined) ? 0 : nTemplates;
if (nTemplates > 10) {
return callback("Too-long template recursion for qid: " + qid);
}
var info = questionDB[qid];
if (info === undefined) {
return callback("QID not found in questionDB: " + qid);
}
var filePath = path.join(qid, filename);
var fullFilePath = path.join(config.questionsDir, filePath);
fs.stat(fullFilePath, function(err, stats) {
if (err) {
// couldn't find the file
if (info.template !== undefined) {
// have a template, try it
return questionFilePath(info.template, filename, callback, nTemplates + 1);
} else {
// no template, give up
return callback("file not found: " + fullFilePath);
}
} else {
// found the file
return callback(null, filePath);
}
});
};
var sendQuestionFile = function(req, res, filename) {
questionFilePath(req.params.qid, filename, function(err, filePath) {
if (err)
return sendError(res, 404, "No such file '" + filename + "' for qid: " + req.params.qid, err);
res.sendfile(filePath, {root: config.questionsDir});
});
};
app.get("/questions/:qid/:filename", function(req, res) {
sendQuestionFile(req, res, req.params.filename);
});
app.get("/users", function(req, res) {
if (!uCollect) {
return sendError(res, 500, "Do not have access to the users database collection");
}
uCollect.find({}, {"uid": 1, "name": 1}, function(err, cursor) {
if (err) {
return sendError(res, 500, "Error accessing users database", err);
}
cursor.toArray(function(err, objs) {
if (err) {
return sendError(res, 500, "Error serializing users", err);
}
async.map(objs, function(u, callback) {
var perms = [];
if (superusers[u.uid] === true)
perms.push("superuser");
callback(null, {
name: u.name,
uid: u.uid,
perms: perms
});
}, function(err, objs) {
if (err) {
return sendError(res, 500, "Error cleaning users", err);
}
filterObjsByAuth(req, objs, function(objs) {
res.json(stripPrivateFields(objs));
});
});
});
});
});
app.get("/users/:uid", function(req, res) {
if (!uCollect) {
return sendError(res, 500, "Do not have access to the users database collection");
}
uCollect.findOne({uid: req.params.uid}, function(err, uObj) {
if (err) {
return sendError(res, 500, "Error accessing users database for uid " + req.params.uid, err);
}
if (!uObj) {
return sendError(res, 404, "No user with uid " + req.params.uid);
}
var perms = [];
if (superusers[uObj.uid] === true)
perms.push("superuser");
var obj = {
name: uObj.name,
uid: uObj.uid,
perms: perms
};
ensureObjAuth(req, res, obj, function(obj) {
res.json(stripPrivateFields(obj));
});
});
});
app.get("/qInstances", function(req, res) {
if (!qiCollect) {
return sendError(res, 500, "Do not have access to the qInstances database collection");
}
var query = {};
if ("uid" in req.query) {
query.uid = req.query.uid;
}
if ("qid" in req.query) {
query.qid = req.query.qid;
}
if ("vid" in req.query) {
query.vid = req.query.vid;
}
qiCollect.find(query, function(err, cursor) {
if (err) {
return sendError(res, 500, "Error accessing qInstances database", err);
}
cursor.toArray(function(err, objs) {
if (err) {
return sendError(res, 500, "Error serializing qInstances", err);
}
filterObjsByAuth(req, objs, function(objs) {
res.json(stripPrivateFields(objs));
});
});
});
});
app.get("/qInstances/:qiid", function(req, res) {
if (!qiCollect) {
return sendError(res, 500, "Do not have access to the qInstances database collection");
}
qiCollect.findOne({qiid: req.params.qiid}, function(err, obj) {
if (err) {
return sendError(res, 500, "Error accessing qInstances database for qiid " + req.params.qiid, err);
}
if (!obj) {
return sendError(res, 404, "No qInstance with qiid " + req.params.qiid);
}
ensureObjAuth(req, res, obj, function(obj) {
res.json(stripPrivateFields(obj));
});
});
});
var makeQInstance = function(req, res, qInstance, callback) {
if (qInstance.uid === undefined) {
return sendError(res, 400, "No user ID provided");
}
if (qInstance.qid === undefined) {
return sendError(res, 400, "No question ID provided");
}
if (qInstance.tiid === undefined) {
return sendError(res, 400, "No tInstance ID provided");
}
qInstance.date = new Date();
var info = questionDB[qInstance.qid];
if (info === undefined) {
return sendError(res, 400, "Invalid QID: " + qInstance.qid);
}
if (qInstance.vid === undefined) {
qInstance.vid = Math.floor(Math.random() * Math.pow(2, 32)).toString(36);
}
ensureObjAuth(req, res, qInstance, function(qInstance) {
newIDNoError(req, res, "qiid", function(qiid) {
qInstance.qiid = qiid;
loadQuestionServer(qInstance.qid, function (server) {
var questionData;
try {
questionData = server.getData(qInstance.vid, info);
qInstance.params = questionData.params || {};
qInstance.trueAnswer = questionData.trueAnswer || {};
qInstance.options = questionData.options || {};
} catch (e) {
return sendError(res, 500, "Error in " + qInstance.qid + " getData(): " + e.toString(), {stack: e.stack});
}
qiCollect.insert(qInstance, {w: 1}, function(err) {
if (err) {
return sendError(res, 500, "Error writing qInstance to database", err);
}
return callback(qInstance);
});
});
});
});
};
app.post("/qInstances", function(req, res) {
var qInstance = {
uid: req.body.uid,
qid: req.body.qid,
tiid: req.body.tiid,
};
readTInstance(res, qInstance.tiid, function(tInstance) {
ensureObjAuth(req, res, tInstance, function(tInstance) {
makeQInstance(req, res, qInstance, function(qInstance) {
res.json(stripPrivateFields(qInstance));
});
});
});
});
app.get("/submissions", function(req, res) {
if (!sCollect) {
return sendError(res, 500, "Do not have access to the submissions database collection");
}
var query = {};
if ("uid" in req.query) {
query.uid = req.query.uid;
}
if ("qid" in req.query) {
query.qid = req.query.qid;
}
sCollect.find(query, function(err, cursor) {
if (err) {
return sendError(res, 500, "Error accessing submissions database", err);
}
cursor.toArray(function(err, objs) {
if (err) {
return sendError(res, 500, "Error serializing submissions", err);
}
filterObjsByAuth(req, objs, function(objs) {
res.json(stripPrivateFields(objs));
});
});
});
});
app.get("/submissions/:sid", function(req, res) {
if (!sCollect) {
return sendError(res, 500, "Do not have access to the submissions database collection");
}
sCollect.findOne({sid: req.params.sid}, function(err, obj) {
if (err) {
return sendError(res, 500, "Error accessing submissions database for sid " + req.params.sid, err);
}
if (!obj) {
return sendError(res, 404, "No submission with sid " + req.params.sid);
}
ensureObjAuth(req, res, obj, function(obj) {
res.json(stripPrivateFields(obj));
});
});
});
var deepClone = function(obj) {
return JSON.parse(JSON.stringify(obj));
};
var readTInstance = function(res, tiid, callback) {
tiCollect.findOne({tiid: tiid}, function(err, obj) {
if (err)
return sendError(res, 500, "Error accessing tInstance database", {tiid: tiid, err: err});
if (!obj)
return sendError(res, 404, "No tInstance with tiid " + tiid, {tiid: tiid, err: err});
return callback(obj);
});
};
var readQInstance = function(res, qiid, callback) {
qiCollect.findOne({qiid: qiid}, function(err, obj) {
if (err)
return sendError(res, 500, "Error accessing qInstance database", {qiid: qiid, err: err});
if (!obj)
return sendError(res, 404, "No qInstance with qiid " + qiid, {qiid: qiid, err: err});
return callback(obj);
});
};
var loadQuestionServer = function(qid, callback) {
questionFilePath(qid, "server.js", function(err, filePath) {
if (err)
return sendError(res, 404, "Unable to find 'server.js' for qid: " + qid, err);
var serverFilePath = path.join(config.questionsDir, filePath);
requirejs([serverFilePath], function(server) {
if (server === undefined)
return sendError("Unable to load 'server.js' for qid: " + qid);
return callback(server);
});
});
};
var readTest = function(res, tid, callback) {
tCollect.findOne({tid: tid}, function(err, obj) {
if (err)
return sendError(res, 500, "Error accessing tests database", {tid: tid, err: err});
if (!obj)
return sendError(res, 404, "No test with tid " + tid, {tid: tid, err: err});
return callback(obj);
});
};
var loadTestServer = function(tid, callback) {
var info = testDB[tid];
var testType = info.type;
var serverFile = testType + "TestServer.js";
requirejs([serverFile], function(server) {
return callback(server);
});
};
var writeTInstance = function(req, res, obj, callback) {
if (obj.tiid === undefined)
return sendError(res, 500, "No tiid for write to tInstance database", {tInstance: obj});
if (obj._id !== undefined)
delete obj._id;
ensureObjAuth(req, res, obj, function(obj) {
tiCollect.update({tiid: obj.tiid}, {$set: obj}, {upsert: true, w: 1}, function(err) {
if (err)
return sendError(res, 500, "Error writing tInstance to database", {tInstance: obj, err: err});
return callback();
});
});
};
var writeTest = function(req, res, obj, callback) {
if (obj.tid === undefined)
return sendError(res, 500, "No tid for write to test database", {test: obj});
if (obj._id !== undefined)
delete obj._id;
tCollect.update({tid: obj.tid}, {$set: obj}, {upsert: true, w: 1}, function(err) {
if (err)
return sendError(res, 500, "Error writing test to database", {test: obj, err: err});
return callback();
});
};
var testProcessSubmission = function(req, res, tiid, submission, callback) {
readTInstance(res, tiid, function(tInstance) {
ensureObjAuth(req, res, tInstance, function(tInstance) {
var tid = tInstance.tid;
readTest(res, tid, function(test) {
loadTestServer(tid, function(server) {
var uid = submission.uid;
try {
server.updateWithSubmission(tInstance, test, submission, testDB[tid].options);
} catch (e) {
return sendError(res, 500, "Error updating test: " + String(e), {err: e, stack: e.stack});
}
writeTInstance(req, res, tInstance, function() {
writeTest(req, res, test, function() {
return callback(submission);
});
});
});
});
});
});
};
app.post("/submissions", function(req, res) {
if (!sCollect) {
return sendError(res, 500, "Do not have access to the submissions database collection");
}
if (!uCollect) {
return sendError(res, 500, "Do not have access to the users database collection");
}
var submission = {
date: new Date(),
uid: req.body.uid,
qiid: req.body.qiid,
submittedAnswer: req.body.submittedAnswer
};
if (submission.uid === undefined) {
return sendError(res, 400, "No user ID provided");
}
if (submission.qiid === undefined) {
return sendError(res, 400, "No qInstance ID provided");
}
if (submission.submittedAnswer === undefined && req.body.overrideScore === undefined) {
return sendError(res, 400, "No submittedAnswer provided");
}
if (req.body.overrideScore !== undefined) {
if (!isSuperuser(req))
return sendError(res, 403, "Superuser permissions required for override");
submission.overrideScore = req.body.overrideScore;
}
if (req.body.practice !== undefined) {
submission.practice = req.body.practice;
}
ensureObjAuth(req, res, submission, function(submission) {
readQInstance(res, submission.qiid, function(qInstance) {
ensureObjAuth(req, res, qInstance, function(qInstance) {
submission.qid = qInstance.qid;
submission.vid = qInstance.vid;
var tiid = qInstance.tiid;
var info = questionDB[submission.qid];
if (info === undefined) {
return sendError(res, 404, "No such QID: " + submission.qid);
}
var options = info.options || {};
options = _.defaults(options, qInstance.options || {});
loadQuestionServer(submission.qid, function (server) {
if (submission.overrideScore !== undefined) {
submission.score = submission.overrideScore;
} else {
var grading;
try {
grading = server.gradeAnswer(qInstance.vid, qInstance.params, qInstance.trueAnswer, submission.submittedAnswer, options);
} catch (e) {
return sendError(res, 500, "Error in " + submission.qid + " gradeAnswer(): " + e.toString(), {stack: e.stack});
}
submission.score = _.isNumber(grading.score) ? grading.score : 0; // make sure score is a Number
submission.score = Math.max(0, Math.min(1, submission.score)); // clip to [0, 1]
submission.feedback = grading.feedback || {};
}
submission.trueAnswer = qInstance.trueAnswer;
newIDNoError(req, res, "sid", function(sid) {
submission.sid = sid;
testProcessSubmission(req, res, tiid, submission, function(submission) {
sCollect.insert(submission, {w: 1}, function(err) {
if (err) {
return sendError(res, 500, "Error writing submission to database", err);
}
res.json(stripPrivateFields(submission));
});
});
});
});
});
});
});
});
app.get("/tests", function(req, res) {
if (!tCollect) {
return sendError(res, 500, "Do not have access to the tCollect database collection");
}